melbmanu wrote:
Is there going to be a significant difference between 35/2 and 35/1.4 sharpness (at f/2) ?

The 35/1.4, according to Lloyd Chambers, does not reach the 35/2's sharpness until f/2.8. The faster lens' transition from in-focus to OOF is more gradual and therefore doesn't give the famed 3D rendering of the slower lens. The veiling flare of SA, pretty much absent in the f/2, is prominent and seriously reduces contrast wide open.